Air pollution dispersion in Hail city: Climate and urban topography impact

Hassen, Walid; Hnaien, Nidhal; Ben Said, Lotfi; Albati, Faris Mohammed; Ayadi, Badreddine; Rajhi, Wajdi; Kolsi, Lioua

doi:10.1016/j.heliyon.2023.e20608

Cited by 4 publications

(3 citation statements)

References 24 publications

(27 reference statements)

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“…CFD can perform simulations with clearly coupled velocity fields, temperature fields, and other fields and can analyze an urban climate on a small scale. For example, Hassen et al used a CFD model that combined meteorological data and urban terrain data to simulate the urban environment of the city of Hail (Saudi Arabia) [89]. But, it requires high-resolution input data and computing resources, which can be simulated through ENVI-met software (https://www.envi-met.com/) [90].…”

Section: Objective Parameter Acquisitionmentioning

confidence: 99%

A Review of Thermal Comfort Evaluation and Improvement in Urban Outdoor Spaces

Liu,

Li,

2023

Buildings

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Urban outdoor space is an important activity place for residents, and its thermal environment directly affects residents’ quality of life and physical and mental health. Due to global climate change and the acceleration of urbanization, the outdoor thermal comfort of urban residents has seriously declined, causing more and more scholars to pay attention to this problem and to carry out research. This paper summarizes the development history and evaluation principles of outdoor thermal comfort evaluation indices and sorts out the methods for achieving outdoor thermal comfort. This paper reviews the effects of urban climate, local microclimate, physiological, psychological, social, and cultural factors on outdoor thermal comfort. In addition, strategies for improving thermal comfort in urban outdoor spaces are discussed from the aspects of urban geometry, vegetation, surface materials, and water bodies. Finally, the existing problems and development directions of current urban outdoor space thermal comfort studies are pointed out. This review paper can provide a reference for the scientific planning and construction of urban outdoor spaces to improve people’s thermal comfort.

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Section: Objective Parameter Acquisitionmentioning

confidence: 99%

A Review of Thermal Comfort Evaluation and Improvement in Urban Outdoor Spaces

Liu,

Li,

2023

Buildings

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“…For instance, in regions like Beijing [75], Hebei Province [76], and Shenyang [77], researchers have successfully den release of hazardous gases, there is a rapid and intense surge in the co causing immediate and significant local variations within the urban landscap microscale meteorological processes [83]; coupled models have proven to b tools to gain comprehensive insights into flow fields, offering a cost-effective approach for risk assessment [84]. Moreover, within urban environments, the interplay of elements such a vegetation, and water bodies significantly shapes wind patterns and turbulen [85][86][87][88], while also influencing heat transfer dynamics [89]. This gives rise non-uniform heating patterns throughout the city, resulting in the delineatio tive urban microclimate characteristics, including the formation of urban h which, in turn, exert profound effects on the broader environmental context standing these intricate dynamics necessitates delving deeply into a multitude physical processes, presenting an imposing challenge.…”

Section: Realistic Simulations Of Microscale Meteorological Processesmentioning

confidence: 99%

“…Moreover, within urban environments, the interplay of elements such as buildings, vegetation, and water bodies significantly shapes wind patterns and turbulence dynamics [85][86][87][88], while also influencing heat transfer dynamics [89]. This gives rise to dynamic, non-uniform heating patterns throughout the city, resulting in the delineation of distinctive urban microclimate characteristics, including the formation of urban heat islands, which, in turn, exert profound effects on the broader environmental context [90].…”

Section: Realistic Simulations Of Microscale Meteorological Processesmentioning

confidence: 99%

Simulating Microscale Urban Airflow and Pollutant Distributions Based on Computational Fluid Dynamics Model: A Review

Liang,

Miao,

Zhang

et al. 2023

Toxics

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Urban surfaces exert profound influences on local wind patterns, turbulence dynamics, and the dispersion of air pollutants, underscoring the critical need for a thorough understanding of these processes in the realms of urban planning, design, construction, and air quality management. The advent of advanced computational capabilities has propelled the computational fluid dynamics model (CFD) into becoming a mature and widely adopted tool to investigate microscale meteorological phenomena in urban settings. This review provides a comprehensive overview of the current state of CFD-based microscale meteorological simulations, offering insights into their applications, influential factors, and challenges. Significant variables such as the aspect ratio of street canyons, building geometries, ambient wind directions, atmospheric boundary layer stabilities, and street tree configurations play crucial roles in influencing microscale physical processes and the dispersion of air pollutants. The integration of CFD with mesoscale meteorological models and cutting-edge machine learning techniques empowers high-resolution, precise simulations of urban meteorology, establishing a robust scientific basis for sustainable urban development, the mitigation of air pollution, and emergency response planning for hazardous substances. Nonetheless, the broader application of CFD in this domain introduces challenges in grid optimization, enhancing integration with mesoscale models, addressing data limitations, and simulating diverse weather conditions.

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